Hanson backs Seselja in 'fair' preselection battle

New Canberra Liberals leader Jeremy Hanson says he is confident the party's Senate preselection process is being run fairly.

Zed Seselja resigned as ACT opposition leader on Monday to challenge Gary Humphries for the top spot on the Liberal ACT Senate ticket.

Senator Humphries has raised concerns the preselection process is being rushed to favour Mr Seselja.

But Mr Hanson disagrees.

"I've had a look at the process and I'm very confident that it's being conducted in accordance with the constitution. So there's been no advantage for one member or another.So in that sense it is a fair process."

Mr Hans on says he will be backing Mr Seselja when ACT members vote next weekend.

"It is a tough contest. The stakes are high as they should be, it will be a tough fight," he said.

"But I'm very confident that once the dust settles, once there is a Senate candidate next week, that everybody will unite behind that candidate and if it's Zed Seselja, I'm very colleague that all his federal colleagues would get behind him."